JPG wrote
Am I to understand that thy return filed LAST year is accessible on IRS.gov for perusal by thee? (Hopefully an exclusive access)
I have never had a need for that 'feature'.
Yes. Several past years (I think 6) can be viewed by simply registering at IRS.GOV. Username and Password established at first log in. To have a complete picture, spouse must also register. Some data (such as SS details) shows only on the registered user page.
SSA.GOV also has a wealth of information available. I strongly recommend to all that you register with these two sites. The SSA site is especially helpful. The IRS site has a lot of info but does not offer a lot of assistance if something doesn't look right.